<template>
	<view>
		<view class="search-box">
			<uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none" focus="true"></uni-search-bar>
		</view>
		
		<!--搜索建议列表-->
		<view class="sugg-list" v-if="searchResult.length !== 0">
			<view class="sugg-item" v-for="(item,i) in searchResult" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!--搜索历史列表-->
		<view class="history-box" v-else>
			<!--标题区域-->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!--列表区域-->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
		
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				//搜索的结果列表
				searchResult:[],
				//搜索历史的数组
				historyList:[]
			};
		},
		onLoad(){
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods:{
			//input输入事件的处理函数
			input(e){
				
				clearTimeout(this.timer)
				console.log('输入值:', e)
				
				this.timer = setTimeout(() =>{
					this.kw = e.trim()
					console.log('实际搜索词:', this.kw)
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				//判断搜索关键词是否为空
				if(this.kw.trim().length === 0){
					this.searchResult = []
					return
				}
				const res = await uni.$http.get('/api/search/suggest',{keyword: this.kw})
				if(res.statusCode !== 200)return uni.$showMsg()
				this.searchResult = res.data.data
				
				this.saveSearchHistory()
			},
			gotoDetail(item){
				console.log(item.goods_id)
				uni.navigateTo({
					url:'/subpkg/goods-detail/goods-detail?goods_id' + item.goods_id
				})
			},
			//保存搜索历史的方法
			saveSearchHistory(){
				//this.historyList.push(this.kw)
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				
				this.historyList = Array.from(set)
				
				//对搜索历史数据，进行持久化的存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url: `/subpkg/goods_list/goods_list?query=${kw}`
				})
			}
		},
		computed:{
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box{
		position: sticky;
		top: 0;
		z-index: 999;
	}
	
	.sugg-list{
		padding: 0 5px;
		
		.sugg-item{
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			
			.goods-name{
				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
			}
		}
	}

	.history-box{
		padding: 0 5px;
		.history-title{
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			.uni-tag{
				margin-top: 5px;
				margin-right: 5px;
			}
		}
	}
</style>
